In response to antigen-antibody binding, mast cells release chemicals called _____________ in an allergic reaction.
A. epinephrine
B. histamine
C. serotonin
D. acetylcholine
Ans: B. histamine
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Answer the following statement true (T) or false (F)
Plants can remove harmful chemicals from the soil by the process of
A. glandular secretion by leaves. B. CO2 activation. C. phytoremediation. D. fertilization. E. root nodule formation.
During regulation by attenuation in the trp operon, if the pause and terminator loops form in mRNA, transcription is uncoupled to translation and protein synthesis is not occurring.
Answer the following statement true (T) or false (F)
A mountain climber was rescued after spending 36 hours exposed to the elements on a slope of Mount Everest. Miraculously, the only permanent damage was to his toes, all of which had to be removed. What was the most likely cause of the damage to his toes?
A. Blood pooling in the veins in his feet B. Metabolic (nitrogenous) wastes pooling in his feet C. Vasoconstriction of the arteries to his legs and feet D. The inability of his white blood cells to destroy infectious bacteria E. Increased levels of carbon dioxide in his feet